Dressing tool for abrading stones



May 4 1926. 1,583,146

H. c. HEON DRESSING TOOL FOR ABRADI'NG STONES .File ay 18. 1925 2Sheets'-Sheet 1 C /1 5 KII x/j & A 5

Patented May 4, 1926.

unites STATES PATENT?orri'ca HORACE o. resort, on onronoo, rLLINoIs,ASSIGNGR' 'ro AuroMofeIvn MAINTENANCE MACHINERY 00., or CHICAGO,ILLINoIs, A CORPORATION ol -ILLINOIS.

DRESSING- TOOL FOR ABRADING STONES.

Application filed May s, 1925. Serial No. 30,943.

To all whom may concern:

Be it known that I, I-Ionncn C. HnoN, a subject of the King of GreatBritain, residing at Chicago, in the county of Cook'and State ofIllinois, have invented certain new and useful Improvements in DressingTools for Abrading Stones of which the following is a specification.

My invention relates to means for dressing in the active surfaces ofabra-ding stones, and

more particularly to a hand tool for dressing the abrasive elements ofcylinder-grinding tools. Cylinder-grinders are known, and in generalcommercial use, wherein a phi-- l rality of relatively long and slenderabrath ing elements or stones are respectively mounted Cl1I1lQli'l18lRbGlfS which are so associated with the rotatable body memberthat, in operation, the several stones will act equally upon and grindthe inner surface of an engine cylinder or the like; and the cf- .ficacyo'fsuch a grinding tool, for protracted use, depends largely on keepingthe several stones properly dressed at their working surfaces, in orderthat all of said stones may protrude equally from their carriers andthat each of said surfaces may be true, straight and non-taperinginshape and may present a clean, sharp, abrading condi- Among theobjects of my invention are,

to provide a hand tool for the stated dressing of the abra'ding elementsof such a cylin der grinder, which will be simple in construction, rapidand accurate in its operationeven in inexpert hands, easy to adjust andoperate, and inexpensive to maintain in good operative condition. And toattain these and further objects, which will become apparent to thoseskilled in the art from the following description taken with theaccompanying drawings, my. invention consists in the combina' ion ofparts and features f construc tion hereinafter described and claimed.

In'the draWingaFigure 1 is a side elevation of a portion of a cylindergrinder equipped with an abrading element such as the dressing-tool isto sharpen and true up; Fig. 2 is a side elevation of the dress1ng-toolin working position with respect to the' abrading stone and thecarrierfor the latter: Fig. Sis a cross-section on line 88 of Fig. 2; Fig. 4 isa perspective detail of an element of the'dressi'ng membershown in Fig;3'; Fig.5 is a perspective-detail of the adjustable bearing block orcarrier memher for said dressing element; Fig. 6 is an edge elevationofv the dressing-tool, from its working edgeyFig. 7 is a centrallongitudinal-section on line 77 of Fig. 6 Fig. 8 is aside elevation of afragment of a modi fied construction; andFig. 9 isan edge elevation,from theworking ec'lge, of the structure shown in Fig. 8. r

In the-drawings a indicates a relatively long, slender abrading stone,Qfcarbo rundum or other suitable material, usually of approximatelysquare cross-section, the outwardly presented portion a whereof is theworking surface or abrading face and the inner portion of which isinvested, at V the bottom and sides, in a channel-shaped sheet-metalholder 6', reinforcingandprotect ingthe part of'the stone which iten'ibraces- Each such stone and its holder ismount-:. ed in a carriermember 0 ofwhich a plurality are provided, these being suitably mountedon a rotatable body d so that when the body is rotated the severalstones may work against the inner surface of a engine cylinder or thelike. In the par ticular construction typically shown: the stone-carrierc is pivoted as at e to the tool body and ispressedoutwardy by a springIn order to be best conditioned for grinding a true cylindrical" surfaceeach stone a, should be dressed, at its outer or workingsurface a". sothat said surface will have its edges longitudinally parallel'to thelongitudinally straight, outwardly presented surhe faces 0 and 0 of' thecarrier 0, and also the crystalline structure of the working surface aof the'stone should be sharp and notloaded with previously-collectedmetal. Also the surface a should have its working as face dressed tostand either at right angle or oblique angle to the side faces of thestone in such degree as will best fitthe working face of the stone tothe inner surface of the cylinder to be ground, according to the loodiameter of thecylinder and the consequent pivotal throw of thestone-carriers c.

The dressing-tool shown in Figs. 2 to 7 inclusive provides a body 10which, in best practice, is considerably longer than the abrading stoneto be dressed and the carrier c therefor, being preferably about twiceas long as th stone-equipped carrienand is of width, at its workingedge, substantially-wider than is'the'stonelto be dressed, L10

so as to afford guide-surfaces Hand 12 which mayeoact with the surfacesand c of the stone-carrier 0. Between the surfaces 11 and 12 the body islongitudinally channeled as 13 to a depth greater than the maximumprotrusion of the stone from the stone-carrier, the channel-width beingpreferably only slightly greater than the width of the stone; and whilethe width of the surfaces 11 and 12 (and consequently extent of theirbearing-contact on the stone-carrier) may be varied, it is preferablethat their transverse or cross-sectional contours shall correspond quiteaccurately with the contours of surfaces 0 and c of the stonecarrier.Also, where the stone is disposed in a holder Z) which protrudes atitsedges somewhat beyond the surfaces 0 and/or 0 of the stone-carrier,recesses as shown at i l and 15 are preferably made in the edge of thedressing-tool body, flanking the stonereceptive channel 13, so that theprotruding portions of said holder Z) may serve as iateral guides, andtake the wear, when the dres ing-tool body is being reciprocatedlongitudinally along the stone-carrier.

The depth of the dressing-tool body need not be great throughout thelongitudinal end portions thereof, but at the center of its length Ipreferably provide a rather deep or tall extension 17 which serves bothas a convenient handle and as an extension frame to receive thebearing-block to be described. Although the contour of such handle partmay be widely varied, it may best be of such longitudinal extent, depth,and top curvature that it may easily be firmly grasped between the heelof the hand and the finger for forceful manipulation of the tool.

In the preferred form of construction a guide-way 18 is formed in thebody as a straight-sided recess opening toward the working face of thebody, extending well into the depth of the extension 17, and open alsoat both side faces of the body and extension. In this guide recess isarranged the adjustable bearing member for the dressing roll, suchmember 19 taking the form of a block making a neat fit in the guideway,said block having two arms 20 laterally separated to accommodate betweenthem the dressing roll 21 and being also apertured as at 22 to affordbearing for the dressing-roll arbor 23.

The main dressing-element 21 is preferably of substantially greaterwidth than the width of the stone, and presents peripherally a series ofpoints or teeth adapted to clean ant, sharpen the stone with a crushingaction. Specifically I prefer that the element be made up of a series oftoothed lamina or relatively thin rings 21, arranged side by sidesubstantially to fill the space between the arms 202O of the bearingblock 19, but

each free to rotate upon'the arbor 23, so

that the crushing-tooth pattern changes during operation as theindividual discs may firmly be held in any adjusted position. To

these ends set screws 26 and 2?, adjustable hrough the top of theextension 17, bear upon the top of the block 19 near opposite side edgesthereof, while set screw 28 worriing through one end face oftheextension 17 engages in a recess 29 in the proximate face of the bearingbloclr 19 and clamps the block against lateral displaceme-nt. E i henset screw 28 is loosened the bloc may be angularly turned or verticallyor laterally moved through quite a range of displacement-s, but therecess 29 being closed at its top, the block may not fall out. Asindicated in 8 by the solid line and dotted line positions of thebearing block 19 a corner of the stone or the entire surface of thestone may be dressed to various angular positions. Each of the setscrews shown has its outer end socketed for reception of a suitablesocket wrench.

Operation of the stone dressing-tool requires no particular training orskill. To merely clean and sharpen the stones of a grinding tool, thebearing bloclr19 is adjusted so that when the dressing roller bears uponthe surface a of the stone the guide-surfaces 11 and 12 of the tool areslightly spaced away from the surfaces 0 and c of the stone carrien,Under quite heavy manual pressure the tool is run back ward and forward,crushing the surface a of the stone into sharpness and cleanliness,until both surfaces 11 and 12 of the tool are sliding upon thecorresponding metal surfaces of the carrier for the stone, substantialside play being prevented by the guidance of the tool-recesses let and15'upon the sides of the stone-holder Z). For dressing a tapered stone(i. e., higher at one end than at the other) to remove the taper, thedressing roller is adjusted for a mere cleaning operation at the low endof the stone and will be worked until the high end is worn down. Fordressing the stone to a new angle of presentation, angular adjustment ofthe roller may be had as suggested in Fig. 3; It will be observed thatby the provision of a long body, having substantially full lengthbearing on the stonecarrier as long as the dressing roller is in thecontact with any portion of the stone, and making the body ofconsiderable width and with ample bearing surfaces for coaction with thestone -carrier on opposite. sides of the stone, it is substantiallyinsured that when the work is finished to the point Where thestone-carrier and tool-body make sliding engagement with their metalsurfaces fully in-contact, the stone will show uniform dressing of allportions that have been in reach of the dressing roller.

For some characters of stone it is desirable that the dressing be moreor less done by a scraping form of tool rather than a crushing form, andas shown in Figs'S and 9, a deep recess 31 may be formed in the workingedge of the tool body opening to that edge and to the side faces of thebody, and extending diagonally from side face .to side face, as bestshown in Fig. 9, preferably at an angle of degrees to the longitudinalline of the channel 13, In this channel is disposed a scraping blade 32toothed at its working surface, and preferably made of laminae, eachserrated at its Working edge,

withthe pack of blades substantially filling the channel 31 and clampedlaterally therein by set screws 33 and 34 entering from opposite sidefaces of the body, the vertical position of'the pack within the recess33 being determined by adjustment of the set screws 36 and 37 enteringthe recess through the top or back of the body. Manifestly, with suchconstruction either the roll or the blades may be used alone, byadjustment of the other to non-functioning position or' by removal oromission of the other.

While I have herein described in some detail particular embodiments ofmy inven- 1 tion for ourooses of full disclosure it will tit] beunderstood by those skilled in the art that numerous changes in detailof construction and arrangement of parts may be made without departurefrom the spirit of my invention, within the scope of the appendedclaims.

I claim:

1. A stone-dressing tool comprising, in combination, a body-memberhaving a stonereceptive channel in one edge and guiding surfacesflanking said channel and adapted to coact with and be guided by thestonecarrier, astone-dressing element extending across the width of saidchannel and adjustable in the direction of depth of sa1dchannel to varyits effective distance from said guidesurfaces, and adjusting means fordetermining the adjusted position of said dressing element.

2.111 a tool for dressing the abrasive stones of cylinder grinders, abody member having longitudinally extensive guide surfaces at one edgethereof for sliding coaction with the abrasive-stone carrier and havinga stone-receptive recess in said edge; a st0ne-dressing element crossingsaid channel adjacent the longitudinal center 01 the body and adjustableto vary its distance from the guiding surfaces of the body, and

s lil at different distances bacl:

means for fixingsaid dressing element in dnterent'ad usted positions.

3. In a hand-tool for dressing the abrading stones of cylinder-grindersand the like,

the combination of a bodyadaptedfor guidcooperation with thestone-carrier and having atone edge a stone-receptive channel flanked bylongitudinally extensive, guiding edge-surfaces; a stone-dressingelement extending across said channel at the longitudinal mid-portion ofthe body and adjustable to vary its distance from and its an-] 'gularrelation to said guldlng edge-surfaces, and. means for fixedlyholdingisaid. element many said position of adjustment.

i. A structure as set, forth in claim wherein said body is provided witha crossslot to receive said dressing-element and said adjustmentdetermining means comprise set screw elements entering said slot fromthe in its working edge a: stonereceptive channel' flanked bylongitudinally extensive guide-surfaces adapted to coact with sur facesof the stonecarr ier, a lateral extension from said body adjacent themiddle of its length, shaped for hand grip; said body having atransverse recess crossing said stone-receptive channel and enteringsaid extension; 21 bearing-member movably arranged in .said recess;toothed dressing roller mounted in said bearing member to extend intoand across said stone-receptive channel, and adjustable means forpositioning said bearing member from the guiding edge-surfaces of thebody.

6. In a hand-toolfor dressing the abrasive stones of cylinder grindersand the like, the combination of a body-member having in its workingedge a stone-receptive chana cylindrical,

ill)

nel flanked by longitudinally extensive guide-surfaces adapted to coactwith surfaces of the stone-carrier, a lateral extension from said bodyadjacent the middle of its length, shaped for hand grip; said bodyhaving a transverse recess crossing said stone-receptive, channel andentering said extension; a bearing-member movably arranged in saidrecess; a cylindrical, toothed dressing roller mounted in said bearingmember to extend into and across said stone-receptive channel,adjustable means for positioning said bearing member atdifferentdistances back from the guiding edge-surfaces of the body, andWith'the dressing roller in different angular positions with respect tosaid guiding surfaces.

7. in a hand-tool for dressing the abrasive stones of cylinder grindersand the like, the combination of a body-member having in its workingedge a stone-receptive channel flanked by longitudinally extensivegnidc-snrii'aces adapted to coact With surfaces of the stone-carrier, alateral extension from said body adjacent the middle 01 its length,shaped for hand grip; said body having a transverse recess crossing saidstone-receptive channel and entering said extension; a bearing-membermovably arranged in said recess; yiindrical, toothed dressing rollermounted in said bearing member to extend into and across saidstonereceptive channel, adjustable means for positioning said bearingmember at difi'er at distances back from the guiding edge-surfaces ofthe body, and With the dressing roller in ditterent angular positionswith respect to said guiding surfaces, said adjusting means comprisingtwo setscrews bearing on the. back of the bearing-member adjacent theside surfaces thereof.

8.111 a dressing-tool for. the abrasive stones of cylinder grinders andthe like, a body member having; a stone-receptive channelin one edge,flanked by edge guide surfaces adapted for coaction with thestone-carrier, and a stone-dressing element arranged transyersely ofsaid channel and n'esentin its workin J-ortion Within the depth or saidchannel, said dressing element comprising a crushing-cylinder havingperipheral teeth and rotatable as the tool is moved along the stone. 7

9.111 a dressing-tool for the abrasive stones or" cylinder grinders andthe like, a body member having a stone-receptive channel in one edge,flanked by edge guide-surfaces adapted for coaction with thestonecarrier, and a stone-dressing element arranged transversely of saidchannel and presenting its Working portion Within the depth or: saidchannel, said dressing element comprising a crushing-cylinder having pe-*ipheral teeth and rotatable as the tool is no d along the stone, saidcylinder compr a plurality oltoothed discs rotatableindependently ofeach other.

10 in a hand-tool for dressing the abrading stones oicylinder grindersand the like, the combination of a body member having in one edgestone-receptive channel and at such edge providingiongitudinallycntensive guide-surfaces flanking said channcl, said bodyhavin adjacent its mid-por-o degth oi said channel.

11. 111 hand-tool for dressing the abrading stones oi: cylinder grindersand the like, the combination of a body member having in one edge astone-receptive channel and at such edge providinglongitudinally-extensive guide-surfaces flanking said channel, said bodyhaving tion a recess crossing said channel; a bearing member arranged insaid recess and movable therein to vary its angular relation to and itsdistance from said guidesun faces, means for positioning said bearingmember fixedly in said body in any adjusted relation aforesaid; and astone-crushing dressing-roll carried by said bearing memher andpresenting the Working portion of its periphery transversely to andWithin the depth of said channel, said roll member" comprising an arbormounted in said hearing member and a plurality of toothed rings arrangedside by side and independently rotatable upon said arbor.

HORACE C. HEON.

adjacent its mid-oor-

